Let us suppose first that \(U\)  is not normal. Note that
\(\operatorname{d}(L_k)\le d=\operatorname{d}(G)\) . By the comments after [1]}, we have that
\(k \le \log _q\frac{n^{d-1}}{\vert \operatorname{H}^1(L/A,A)\vert }.\) 
